Originally Posted by
FlightDetent
Perhaps the question can be rephrased.
What is the limiting altitude, where the engine is no longer capable to provide any more than MAX CLB thrust, and so moving the thrust levers beyond the CLB detent yields no reaction?
Top of my head, I do not know. The feeling is maybe as low as FL170, but that's just a shot in the dark. It had been discussed before.
It varies a bit between different aircraft and engine types, but the takeoff envelope is typically defined up somewhere between 15k and 18k, and airspeed up to around Mach 0.5. Go faster than that, and/or higher than that, and pushing the throttles beyond max climb doesn't do anything.